In our pilot study already mentioned, which had included
a similar population of people with COPD, we found the
mean baseline 6MWD to be 365 m, with a standard deviation
of 74 m.30 The acknowledged minimal clinical important
difference (MCID) at that time was reported as 54 m.32 To
achieve this difference in exercise capacity, for power of 0.8
and level of significance of 0.05, using a two-sided t-test for
our primary outcome of 6MWD, we calculated that the cur-
rent study would require 31 participants in each arm to allow
demonstration of superiority for the active intervention by
this amount. Allowing for the 25% dropout rate seen in the
In our pilot study already mentioned, which had includeda similar population of people with COPD, we found themean baseline 6MWD to be 365 m, with a standard deviationof 74 m.30 The acknowledged minimal clinical importantdifference (MCID) at that time was reported as 54 m.32 Toachieve this difference in exercise capacity, for power of 0.8and level of significance of 0.05, using a two-sided t-test forour primary outcome of 6MWD, we calculated that the cur-rent study would require 31 participants in each arm to allowdemonstration of superiority for the active intervention bythis amount. Allowing for the 25% dropout rate seen in the
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